Unexpected field value in snapshot file
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Problem
amdump(8) fails with e.g.,
planner: disk HOSTNAME:/path, estimate of level NNN failed: -1.
and an examination of the relevant sendsize log reveals
tar: Unexpected field value in snapshot file
yet the estimate of the level 0 succeeded.
Solution
There are two possible causes for this problem.
If you are using a version of Amanda prior to 2.5.0p2 with GNU tar 1.15.91 or later, then this is due to a format change in tar that is not recognized by Amanda. Either upgrade Amanda to a newer version, or downgrade tar.
This error may also be caused by corrupt tar incremental snapshot files; in this case, removing the suspect file (without the .new suffix) will correct the error.
Links
- http://www.mail-archive.com/[email protected]/msg35326.html
- http://forums.zmanda.com/archive/index.php/t-299.html
- http://savannah.gnu.org/bugs/?18487 (possible source of snapshot corruption)